New experimental data of the liquid helium inelastic neutron scatterin
g are reported. With the help of two Gaussian fitting procedure it was
shown that for wave vectors q > q0 = 0.48angstrom-1, the sharp phonon
-maxon-roton peak consists of two modes, thus, elementary excitation s
pectrum possesses a complex structure. We can assume that one of these
modes belongs to the neutron scattering as on the usual, ''normal'' f
luid, while the other mode being connected with the liquid excitations
induced by the presence of the bose-condensate.